2 * (C) Copyright 2000-2004
5 * SPDX-License-Identifier: GPL-2.0+
11 #ifdef CONFIG_SYS_64BIT_LBA
12 typedef uint64_t lbaint_t;
13 #define LBAFlength "ll"
15 typedef ulong lbaint_t;
16 #define LBAFlength "l"
18 #define LBAF "%" LBAFlength "x"
19 #define LBAFU "%" LBAFlength "u"
21 /* Interface types: */
36 IF_TYPE_COUNT, /* Number of interface types */
40 * With driver model (CONFIG_BLK) this is uclass platform data, accessible
41 * with dev_get_uclass_platdata(dev)
45 * TODO: With driver model we should be able to use the parent
46 * device's uclass instead.
48 enum if_type if_type; /* type of the interface */
49 int devnum; /* device number */
50 unsigned char part_type; /* partition type */
51 unsigned char target; /* target SCSI ID */
52 unsigned char lun; /* target LUN */
53 unsigned char hwpart; /* HW partition, e.g. for eMMC */
54 unsigned char type; /* device type */
55 unsigned char removable; /* removable device */
57 /* device can use 48bit addr (ATA/ATAPI v7) */
60 lbaint_t lba; /* number of blocks */
61 unsigned long blksz; /* block size */
62 int log2blksz; /* for convenience: log2(blksz) */
63 char vendor[40+1]; /* IDE model, SCSI Vendor */
64 char product[20+1]; /* IDE Serial no, SCSI product */
65 char revision[8+1]; /* firmware revision */
66 #if CONFIG_IS_ENABLED(BLK)
68 * For now we have a few functions which take struct blk_desc as a
69 * parameter. This field allows them to look up the associated
70 * device. Once these functions are removed we can drop this field.
74 unsigned long (*block_read)(struct blk_desc *block_dev,
78 unsigned long (*block_write)(struct blk_desc *block_dev,
82 unsigned long (*block_erase)(struct blk_desc *block_dev,
85 void *priv; /* driver private struct pointer */
89 #define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz))
90 #define PAD_TO_BLOCKSIZE(size, blk_desc) \
91 (PAD_SIZE(size, blk_desc->blksz))
93 #ifdef CONFIG_BLOCK_CACHE
95 * blkcache_read() - attempt to read a set of blocks from cache
97 * @param iftype - IF_TYPE_x for type of device
98 * @param dev - device index of particular type
99 * @param start - starting block number
100 * @param blkcnt - number of blocks to read
101 * @param blksz - size in bytes of each block
102 * @param buf - buffer to contain cached data
104 * @return - '1' if block returned from cache, '0' otherwise.
106 int blkcache_read(int iftype, int dev,
107 lbaint_t start, lbaint_t blkcnt,
108 unsigned long blksz, void *buffer);
111 * blkcache_fill() - make data read from a block device available
114 * @param iftype - IF_TYPE_x for type of device
115 * @param dev - device index of particular type
116 * @param start - starting block number
117 * @param blkcnt - number of blocks available
118 * @param blksz - size in bytes of each block
119 * @param buf - buffer containing data to cache
122 void blkcache_fill(int iftype, int dev,
123 lbaint_t start, lbaint_t blkcnt,
124 unsigned long blksz, void const *buffer);
127 * blkcache_invalidate() - discard the cache for a set of blocks
128 * because of a write or device (re)initialization.
130 * @param iftype - IF_TYPE_x for type of device
131 * @param dev - device index of particular type
133 void blkcache_invalidate(int iftype, int dev);
136 * blkcache_configure() - configure block cache
138 * @param blocks - maximum blocks per entry
139 * @param entries - maximum entries in cache
141 void blkcache_configure(unsigned blocks, unsigned entries);
144 * statistics of the block cache
146 struct block_cache_stats {
149 unsigned entries; /* current entry count */
150 unsigned max_blocks_per_entry;
151 unsigned max_entries;
155 * get_blkcache_stats() - return statistics and reset
157 * @param stats - statistics are copied here
159 void blkcache_stats(struct block_cache_stats *stats);
163 static inline int blkcache_read(int iftype, int dev,
164 lbaint_t start, lbaint_t blkcnt,
165 unsigned long blksz, void *buffer)
170 static inline void blkcache_fill(int iftype, int dev,
171 lbaint_t start, lbaint_t blkcnt,
172 unsigned long blksz, void const *buffer) {}
174 static inline void blkcache_invalidate(int iftype, int dev) {}
178 #if CONFIG_IS_ENABLED(BLK)
181 /* Operations on block devices */
184 * read() - read from a block device
186 * @dev: Device to read from
187 * @start: Start block number to read (0=first)
188 * @blkcnt: Number of blocks to read
189 * @buffer: Destination buffer for data read
190 * @return number of blocks read, or -ve error number (see the
191 * IS_ERR_VALUE() macro
193 unsigned long (*read)(struct udevice *dev, lbaint_t start,
194 lbaint_t blkcnt, void *buffer);
197 * write() - write to a block device
199 * @dev: Device to write to
200 * @start: Start block number to write (0=first)
201 * @blkcnt: Number of blocks to write
202 * @buffer: Source buffer for data to write
203 * @return number of blocks written, or -ve error number (see the
204 * IS_ERR_VALUE() macro
206 unsigned long (*write)(struct udevice *dev, lbaint_t start,
207 lbaint_t blkcnt, const void *buffer);
210 * erase() - erase a section of a block device
212 * @dev: Device to (partially) erase
213 * @start: Start block number to erase (0=first)
214 * @blkcnt: Number of blocks to erase
215 * @return number of blocks erased, or -ve error number (see the
216 * IS_ERR_VALUE() macro
218 unsigned long (*erase)(struct udevice *dev, lbaint_t start,
222 * select_hwpart() - select a particular hardware partition
224 * Some devices (e.g. MMC) can support partitioning at the hardware
225 * level. This is quite separate from the normal idea of
226 * software-based partitions. MMC hardware partitions must be
227 * explicitly selected. Once selected only the region of the device
228 * covered by that partition is accessible.
230 * The MMC standard provides for two boot partitions (numbered 1 and 2),
231 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
233 * @desc: Block device to update
234 * @hwpart: Hardware partition number to select. 0 means the raw
235 * device, 1 is the first partition, 2 is the second, etc.
236 * @return 0 if OK, -ve on error
238 int (*select_hwpart)(struct udevice *dev, int hwpart);
241 #define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops)
244 * These functions should take struct udevice instead of struct blk_desc,
245 * but this is convenient for migration to driver model. Add a 'd' prefix
246 * to the function operations, so that blk_read(), etc. can be reserved for
247 * functions with the correct arguments.
249 unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start,
250 lbaint_t blkcnt, void *buffer);
251 unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
252 lbaint_t blkcnt, const void *buffer);
253 unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start,
257 * blk_find_device() - Find a block device
259 * This function does not activate the device. The device will be returned
260 * whether or not it is activated.
262 * @if_type: Interface type (enum if_type_t)
263 * @devnum: Device number (specific to each interface type)
264 * @devp: the device, if found
265 * @return 0 if found, -ENODEV if no device found, or other -ve error value
267 int blk_find_device(int if_type, int devnum, struct udevice **devp);
270 * blk_get_device() - Find and probe a block device ready for use
272 * @if_type: Interface type (enum if_type_t)
273 * @devnum: Device number (specific to each interface type)
274 * @devp: the device, if found
275 * @return 0 if found, -ENODEV if no device found, or other -ve error value
277 int blk_get_device(int if_type, int devnum, struct udevice **devp);
280 * blk_first_device() - Find the first device for a given interface
282 * The device is probed ready for use
284 * @devnum: Device number (specific to each interface type)
285 * @devp: the device, if found
286 * @return 0 if found, -ENODEV if no device, or other -ve error value
288 int blk_first_device(int if_type, struct udevice **devp);
291 * blk_next_device() - Find the next device for a given interface
293 * This can be called repeatedly after blk_first_device() to iterate through
294 * all devices of the given interface type.
296 * The device is probed ready for use
298 * @devp: On entry, the previous device returned. On exit, the next
300 * @return 0 if found, -ENODEV if no device, or other -ve error value
302 int blk_next_device(struct udevice **devp);
305 * blk_create_device() - Create a new block device
307 * @parent: Parent of the new device
308 * @drv_name: Driver name to use for the block device
309 * @name: Name for the device
310 * @if_type: Interface type (enum if_type_t)
311 * @devnum: Device number, specific to the interface type, or -1 to
312 * allocate the next available number
313 * @blksz: Block size of the device in bytes (typically 512)
314 * @size: Total size of the device in bytes
315 * @devp: the new device (which has not been probed)
317 int blk_create_device(struct udevice *parent, const char *drv_name,
318 const char *name, int if_type, int devnum, int blksz,
319 lbaint_t size, struct udevice **devp);
322 * blk_create_devicef() - Create a new named block device
324 * @parent: Parent of the new device
325 * @drv_name: Driver name to use for the block device
326 * @name: Name for the device (parent name is prepended)
327 * @if_type: Interface type (enum if_type_t)
328 * @devnum: Device number, specific to the interface type, or -1 to
329 * allocate the next available number
330 * @blksz: Block size of the device in bytes (typically 512)
331 * @size: Total size of the device in bytes
332 * @devp: the new device (which has not been probed)
334 int blk_create_devicef(struct udevice *parent, const char *drv_name,
335 const char *name, int if_type, int devnum, int blksz,
336 lbaint_t size, struct udevice **devp);
339 * blk_prepare_device() - Prepare a block device for use
341 * This reads partition information from the device if supported.
343 * @dev: Device to prepare
344 * @return 0 if ok, -ve on error
346 int blk_prepare_device(struct udevice *dev);
349 * blk_unbind_all() - Unbind all device of the given interface type
351 * The devices are removed and then unbound.
353 * @if_type: Interface type to unbind
354 * @return 0 if OK, -ve on error
356 int blk_unbind_all(int if_type);
359 * blk_find_max_devnum() - find the maximum device number for an interface type
361 * Finds the last allocated device number for an interface type @if_type. The
362 * next number is safe to use for a newly allocated device.
364 * @if_type: Interface type to scan
365 * @return maximum device number found, or -ENODEV if none, or other -ve on
368 int blk_find_max_devnum(enum if_type if_type);
371 * blk_select_hwpart() - select a hardware partition
373 * Select a hardware partition if the device supports it (typically MMC does)
375 * @dev: Device to update
376 * @hwpart: Partition number to select
377 * @return 0 if OK, -ve on error
379 int blk_select_hwpart(struct udevice *dev, int hwpart);
382 * blk_get_from_parent() - obtain a block device by looking up its parent
386 int blk_get_from_parent(struct udevice *parent, struct udevice **devp);
391 * These functions should take struct udevice instead of struct blk_desc,
392 * but this is convenient for migration to driver model. Add a 'd' prefix
393 * to the function operations, so that blk_read(), etc. can be reserved for
394 * functions with the correct arguments.
396 static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start,
397 lbaint_t blkcnt, void *buffer)
400 if (blkcache_read(block_dev->if_type, block_dev->devnum,
401 start, blkcnt, block_dev->blksz, buffer))
405 * We could check if block_read is NULL and return -ENOSYS. But this
406 * bloats the code slightly (cause some board to fail to build), and
407 * it would be an error to try an operation that does not exist.
409 blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer);
410 if (blks_read == blkcnt)
411 blkcache_fill(block_dev->if_type, block_dev->devnum,
412 start, blkcnt, block_dev->blksz, buffer);
417 static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
418 lbaint_t blkcnt, const void *buffer)
420 blkcache_invalidate(block_dev->if_type, block_dev->devnum);
421 return block_dev->block_write(block_dev, start, blkcnt, buffer);
424 static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start,
427 blkcache_invalidate(block_dev->if_type, block_dev->devnum);
428 return block_dev->block_erase(block_dev, start, blkcnt);
432 * struct blk_driver - Driver for block interface types
434 * This provides access to the block devices for each interface type. One
435 * driver should be provided using U_BOOT_LEGACY_BLK() for each interface
436 * type that is to be supported.
438 * @if_typename: Interface type name
439 * @if_type: Interface type
440 * @max_devs: Maximum number of devices supported
441 * @desc: Pointer to list of devices for this interface type,
442 * or NULL to use @get_dev() instead
445 const char *if_typename;
446 enum if_type if_type;
448 struct blk_desc *desc;
450 * get_dev() - get a pointer to a block device given its number
452 * Each interface allocates its own devices and typically
453 * struct blk_desc is contained with the interface's data structure.
454 * There is no global numbering for block devices. This method allows
455 * the device for an interface type to be obtained when @desc is NULL.
457 * @devnum: Device number (0 for first device on that interface,
459 * @descp: Returns pointer to the block device on success
460 * @return 0 if OK, -ve on error
462 int (*get_dev)(int devnum, struct blk_desc **descp);
465 * select_hwpart() - Select a hardware partition
467 * Some devices (e.g. MMC) can support partitioning at the hardware
468 * level. This is quite separate from the normal idea of
469 * software-based partitions. MMC hardware partitions must be
470 * explicitly selected. Once selected only the region of the device
471 * covered by that partition is accessible.
473 * The MMC standard provides for two boot partitions (numbered 1 and 2),
474 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
475 * Partition 0 is the main user-data partition.
477 * @desc: Block device descriptor
478 * @hwpart: Hardware partition number to select. 0 means the main
479 * user-data partition, 1 is the first partition, 2 is
481 * @return 0 if OK, other value for an error
483 int (*select_hwpart)(struct blk_desc *desc, int hwpart);
487 * Declare a new U-Boot legacy block driver. New drivers should use driver
488 * model (UCLASS_BLK).
490 #define U_BOOT_LEGACY_BLK(__name) \
491 ll_entry_declare(struct blk_driver, __name, blk_driver)
493 struct blk_driver *blk_driver_lookup_type(int if_type);
495 #endif /* !CONFIG_BLK */
498 * blk_get_devnum_by_typename() - Get a block device by type and number
500 * This looks through the available block devices of the given type, returning
501 * the one with the given @devnum.
503 * @if_type: Block device type
504 * @devnum: Device number
505 * @return point to block device descriptor, or NULL if not found
507 struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum);
510 * blk_get_devnum_by_type() - Get a block device by type name, and number
512 * This looks up the block device type based on @if_typename, then calls
513 * blk_get_devnum_by_type().
515 * @if_typename: Block device type name
516 * @devnum: Device number
517 * @return point to block device descriptor, or NULL if not found
519 struct blk_desc *blk_get_devnum_by_typename(const char *if_typename,
523 * blk_dselect_hwpart() - select a hardware partition
525 * This selects a hardware partition (such as is supported by MMC). The block
526 * device size may change as this effectively points the block device to a
527 * partition at the hardware level. See the select_hwpart() method above.
529 * @desc: Block device descriptor for the device to select
530 * @hwpart: Partition number to select
531 * @return 0 if OK, -ve on error
533 int blk_dselect_hwpart(struct blk_desc *desc, int hwpart);
536 * blk_list_part() - list the partitions for block devices of a given type
538 * This looks up the partition type for each block device of type @if_type,
539 * then displays a list of partitions.
541 * @if_type: Block device type
542 * @return 0 if OK, -ENODEV if there is none of that type
544 int blk_list_part(enum if_type if_type);
547 * blk_list_devices() - list the block devices of a given type
549 * This lists each block device of the type @if_type, showing the capacity
550 * as well as type-specific information.
552 * @if_type: Block device type
554 void blk_list_devices(enum if_type if_type);
557 * blk_show_device() - show information about a given block device
559 * This shows the block device capacity as well as type-specific information.
561 * @if_type: Block device type
562 * @devnum: Device number
563 * @return 0 if OK, -ENODEV for invalid device number
565 int blk_show_device(enum if_type if_type, int devnum);
568 * blk_print_device_num() - show information about a given block device
570 * This is similar to blk_show_device() but returns an error if the block
571 * device type is unknown.
573 * @if_type: Block device type
574 * @devnum: Device number
575 * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block
576 * device is not connected
578 int blk_print_device_num(enum if_type if_type, int devnum);
581 * blk_print_part_devnum() - print the partition information for a device
583 * @if_type: Block device type
584 * @devnum: Device number
585 * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if
586 * the interface type is not supported, other -ve on other error
588 int blk_print_part_devnum(enum if_type if_type, int devnum);
591 * blk_read_devnum() - read blocks from a device
593 * @if_type: Block device type
594 * @devnum: Device number
595 * @blkcnt: Number of blocks to read
596 * @buffer: Address to write data to
597 * @return number of blocks read, or -ve error number on error
599 ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
600 lbaint_t blkcnt, void *buffer);
603 * blk_write_devnum() - write blocks to a device
605 * @if_type: Block device type
606 * @devnum: Device number
607 * @blkcnt: Number of blocks to write
608 * @buffer: Address to read data from
609 * @return number of blocks written, or -ve error number on error
611 ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start,
612 lbaint_t blkcnt, const void *buffer);
615 * blk_select_hwpart_devnum() - select a hardware partition
617 * This is similar to blk_dselect_hwpart() but it looks up the interface and
620 * @if_type: Block device type
621 * @devnum: Device number
622 * @hwpart: Partition number to select
623 * @return 0 if OK, -ve on error
625 int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart);